Pro-government Iranians have been rallying to mark the 31st anniversary of the nation's revolution. President Mahmoud Ahmadinejad used the rally to attack the West, and said Iran had produced its first stock of 20% enriched uranium. The opposition is trying to stage counter-demonstrations but faces a big security crackdown. The BBC's Persian TV channel has been covering events in Iran, The World's Laura Lynch visited the channel.

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